Well reamer



April 25, 1933. Q HAMMER 1,905,860

WELL REAMER Filed April 22, 1931 FIE 2.

IflVENTEIR EI'T' TC] HAMMER 1L WMWM Patented Apr. 25, 1933 UNITED. STATES PATENT OFFICE OTTO HAMMER, OF WHITTIER, CALIFORNIA, ASSIGNOR TO SECURITY ENGINEERING -COMPANY, RENO, NEVADA, A CORPORATION OF NEVADA wnm. manna Application filed April 22,

.an improved form of well .reamer having many of the advantages present in the well reamer disclosed in the U. S. Patent 1,809,-

258 of June 9, 1931 of John A. Vertson, in that as the reamer rotates in the well rolling or rotating edges are presented to the walls of the well which are inclined to the paths of movements of the edges so that during the reaming operation an eiiective shearing or scarifying action takes place.

Another object of the present invention is to provide a well reamer which is of relatively simple construction enabling vertical holes to be drilled in the body for the reception of cutter pins which are surrounded bylaterally inclined bushings on which the cutters rotate. By this arrangement of parts the cutters will be arranged in alignment with the direction of alignment extending lengthwise of the cutter but the individual cutters will rotate about laterally inclined axes, causing the desired shearing or scarifying action to take place on the walls of the well.

With the foregoing and other objects in view, which will be made manifest in the following detailed description, and specifically pointed out in the appended claims, reference is had to the accompanying drawing for an illustrative embodiment of the invention, wherein:

Fig. 1 is a view in side elevation of the improved reamer, parts being broken away, and shown in section.

Fig. 2 is a horizontal section taken upon the line 22 upon Fig. 1.

Referring to the accompanying drawing, wherein similar reference characters designate similar parts throughout, the improved well reamercomprises a body 10 having a central enlarged portion 11, a pin 12, and a box 13. In the enlarged portion 11 there are formed cutter recesses 14, these recesses being illustrated as being three in number although the number of recesses and the number of cutter assemblies disposed therein may vary. The recesses 14 define bosses 15 and 16 at the top and bottom of the central enlarged 1931. Serial No. 531,986.

portion 11. Vertical holes 17 are drilled through the bosses 15 and 16 for the reception of a cutter pin 18. The hole in boss 16 has its lower end reduced in size as indicated at l9 and a suitable device, not shown, is employed for locking the cutter pin 18 in the hole 17. The purpose of reducing the size of the hole in boss 16 is to prevent the cutter pin from dropping through and enabling a punch to be inserted in the small hole 19 to drive out the pin when it is desired to replace cutter assemblies.

On the cutter pin 18 there is positioned a series off-bushings 20. Each bushing is cylindrical in form and has an inclined aperture formed therethrough for the reception of the cutter pin 18 so that when the bushings are positioned on the cutter pin the planes of the bushings will be laterally inclined with respect to the cutter pin 18 at other than a right angle. The planes of the bushings preferably are inclined downwardly toward the left as shown in Figure 1 so that as the body rotates toward the right, as is conventional in well drilling practice, the disc like cutters 21 which are rotatable on the bushings will rotate about axes which are upwardly inclined toward the direction of'rotation. The disc like cutters 21 which rotates about their respective bushings are held in place by engagement with adjacent bushings and adjacent cutters. These bushings may be flanged, as shown, if desired. The bushings 20 are held against rotation on the cutter pin 18 by lock washers 22 and 23. These look washers fit between the bosses and the endniost bushings. The bosses are preferably so formed that the washers which are provided with-lugs 24 fit in recesses in the bosses to prevent the washers from turning and as the washers are held in inclined positions by the bosses they effectively prevent the bushings from turning. The discs, however, are free to rot-ate on their-respective bushings. The discs are thus rotatable about oblique axes which are oblique in tangential planes about the longitudinal vertical central axis of the body.

From the above described construction it will be appreciated that the improved well reamer isa very simple construction and can be chea ly manufactured in that the discs and bushings may be all alike, that is of the same size. If desired, however, the cutters in any cutter assembly may be of varying sizes so that instead of forming a cylindrical reamer as shown a tapering reamer can be provided. The cutters are so positioned as to cause the desired shearing or scarifying action to take place on the walls of the Well during the reaming.

Various changes may be made in the details of construction without departing from the spirit or scope of the invention as defined by the appended claims.

I claim:

1. A well reamer comprisin a body, a cutter pin mounted upon the body remote from the vertical central axis of the body, a plurality of bushings mounted upon the cutter pin, the planes of the bushings being inclined at other than a right angle to the cutter in, and disc like cutters rotatable upon the ushings.

2. A well reamer comprisin a body, a cutter pin mounted upon the b0 y remote from the vertical central axis of the body, a plurality of bushings mounted 'upon the cutter pin, the planes of the bushings being lateral ly inclined at other than a right angle to the cutter pin, and disc like cutters rotatable upon the bushings.

' 3. A well reamer cutter assembly comprising a cutter pin having its top and bottom designed to fit a reamer body, bushings mounted upon the cutter assembly, the planes of the bushings being inclined at other than a right angle to the cutter pin, and disc like cutters rotatable upon the bushings.

4. A well reamer comprising a body having cutter recesses therein, cutter pins ex tending through the recesses from top to bottom thereof, bushings mounted upon the cutter ins, the planes of the bushings being latera y inclined through the cutter pin at other than a right angle thereto, means for locking the topand bottom bushings against rotation on the cutter pin, and cutters rotatable on the bushings.

In testimony whereof I have signed my name to this specification.

OTTO HAMMER. 

